Ring Closure of 4-Azido-3-phenyl-pyridazines to Pyridazino[4,3-b]indoles
- 1 January 1989
- journal article
- research article
- Published by Georg Thieme Verlag KG in Synthesis
- Vol. 1989 (10) , 781-783
- https://doi.org/10.1055/s-1989-27395
Abstract
The cyclization of 4-azido-3-phenylpyridazines and 7-azido-6-phenyl-tetrazolo [1,5-b]pyridazine by heating with strong acids like methanesulfonic acid affords 5H-pyridazino[4,3-b] indoles or 10H-tetrazolo[1′,5′:1,6]pyridazino[4,3-b] indoles, respectively, whereas the conventional photochemical or thermolytic methods fail.Keywords
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